Writing instrument retainer



FIG. 1 is a perspective view of a writing instrument retainer showing the design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a top plan thereof; and,

FIG. 6 is a bottom plan view thereof; 

The ornamental design for a writing instrument retainer, as shown and described. 